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(a) In your OWN words, explain Gay Lussac's Law of Combining Volumes and how it relates to a balanced equation. (copied answers will get no credit) (b) In Part 1, how will you know when the reactant gases are mixed in the CORRECT ratio ? Part 2 of this experiment involves a titration between Gas A and a sample of air to determine the oxygen content of air. (c) What happens to the residual volume in the graduated cylinder during the titration ? Clearly choose one answer. The residual volume stays the same. The residual volume is zero. The residual volume increases for the entire titration. The residual volume increases then decreases. The residual volume decreases for the entire titration. The residual volume decreases then increases.